SIM-Unlocked Moto X won't update from Jelly Bean

As the title says, I bought a new and SIM-Unlocked Moto X from a vendor (phone was originally a Sprint device), and when I try to update the software to presumably KitKat, they phone says I'm "Up-To-Date". The phone's settings show that I'm still on 4.2.2, and even the Motorola Device Manager on my home PC says that there are no updates available when using USB cable to check for updates. What's going on here? I know Sprint rolled-out 4.4.4 for this nearly a year ago.

While I haven't tried this myself yet, this looks like it MIGHT, help. Let us know if it does, as I might have to try this in the future. I have a 2013 AT&T branded Moto-X, and I switched to Cricket a couple of months ago. I've been wondering if I will continue to get OTA updates (or rather, maybe how long I'll have to wait after everyone else gets them...). From this page that tells how to update your phone, there is a link with instructions about being able to do updates using the Motorola Device Manager program.

While I haven't tried this myself yet, this looks like it MIGHT, help. Let us know if it does, as I might have to try this in the future. I have a 2013 AT&T branded Moto-X, and I switched to Cricket a couple of months ago. I've been wondering if I will continue to get OTA updates (or rather, maybe how long I'll have to wait after everyone else gets them...). From this page that tells how to update your phone, there is a link with instructions about being able to do updates using the Motorola Device Manager program.

This is one of the first things I tried, and also does not work. The Device Manager simply says that there are no updates. Thanks though.